Projector



y 1939- 0. 'E. TRAUTMANN PRQJECTQR Filed July 2, 19s"! 2 Sheets-Sheet OTTO E.TRAUT MAN N INVENTOR.

ATTORNEYS July 4, 1939. o. E. TRAUTMANN PROJECTOR Filed July 2, 19s? 2 Sheets-Sheet 2 OTTO ETRAUTMANN INVENTOR.

ATTORNEYS Patented July 4, 1939- l v 2,164,847

. UNITED STATES PATENT orr ci-z PROJECTOR om E. Trautmann, Irondequolt, N. Y., asslgnor to Bausch & Lomb Optical Company, Rochester, N. Y., a corporation of New York Application July 2, 937, Serial No. 151,389 v Claims. 01. 88-24) The present invention relates to optical appaend .a ring l3. The slide is provided with two ratus and more particularly to projectors and laterally projecting ears l4 and and a pin I6, mounting mechanisms therefor. secured to the ring I3, extends between these In aerial mapping systems such as that shown cars. A spring pressed plunger l1, carried by the 5 in U. S. Patent No. 1,980,657 issued November 13,, ear |4, engages the pin IE on one side and a screw 5 1934, to W. Bauer sfeld, there are several essential l8, threaded in the ear l5, engages the other side conditions to be met. The diapositive must be '-of the pin IS. The screw I8 is provided with a placed in the projector so that the point interknurled knob l3 and actuation of the screw it sected by the optical axis of the taking camera causes the ring l3 to pivot on the shaft 10, lies on the optical axisof the projector; the rear Two pivot pins and 2| extend inwardly from m nodal point of the objective must lie in a fixed the ring I3 and form bearings for a second ring predetermined position relative to the diapositive; 22. The pivotal axis of the second ring 22 formed and the projector must be universally mounted in by the pivot pins 20 and 2| is perpendicular to such a position that the front nodal point of the and coplanar with the axis of the shaft II. The

15 objective is at the point of intersection of the ring I3 is provided with two upstanding ears 23 u axes of the universal movement. Heretofore, and 24 and a pin 25, fixed on the second ring 22, these relative positions have been obtained by extends between these ears. A spring pressed trial and error methods and, as a result, the proplunger 26, carried bythe ear 23, engages one jectorswere difficult to manufacture, tedious to side of the pin 25 and a screw 21, threaded in 20 adjust and not accurately uniform. the ear 24, engages the other side of the pin 25 20 One of the objects of the present invention is The screw 21 is actuated by means of a knurled to provide a new and improved projection appaknob 28 and causes the second ring 22 to rock on ratus for aerial mapping. Another object is to the pivot pins 23 and 2|. provide a mapping projector having new and im- A tube. 29 is slidably and rotatably mounted 25 proved means for locating the diapositive. Anwithin thesecond ring 22s This tube is threaded 25 other object is to provide a mapping projector at 30 and 3| above and below the second ring 22 having a simple, accurate and effective means for and collars 32 and 33 are threaded on the pprtions locating the objective relative to the diapositive. 3|].and 3|, respectively. 'The axial position of the A further object is to provide a cardan suspension tube 29 is determined by the positions of the col- .3 and means for accurately locating the projector lars 32 and 33 and when these collars engage the 30 in the suspension with the projection" objective in top and bottom of the second ring 22, the tube predetermined relation to the suspension. These 29 is secured against axial movement but is free and other objects and advantages reside in certo rotate about an axis which intersects perpentain novel features of construction, arrangement dicularly the pivotal axis of the ring 22 and the and combination of parts as will hereinafter be axis of the shaft II. An annular ring 34 is ro- 35 more fully set forth and pointed out in the aptatably secured on the tube 29 by means of a pended claims. threaded collar 35 and this ring may be locked- Referring to the drawings: to the tube 29 by a set screw 36 which is threaded Fig. 1 is a perspective view of a projector emthrough the ring 34 and engages the tube 29.

bodying the present invention. c The annular ring 34 has a pin 31 which projects 4o Fig. 2 is a front elevation thereof with parts laterally between two upstanding ears 38 and 39 in section. i on a bracket 40 secured on the second ring 22 Fig, 3 is a fragmentary side elevation with parts by screws 4|. A spring pressed plunger 42, carin section. ried by the ear, engages, one side of the pin Fig. 4 is a section taken on line .4-4 of Fig. 2. 31 and a screw 43 threaded in theear 39, engages 45 Fig. 5 is an enlarged section taken on line 5-5 the other side of the pin 31. The screw 43 is of Fig. 4. actuated by a knurled knob 44 and causes rotary A preferred embodiment of the present invenmovement of the annular ring 34 relative to the tion is illustrated in the drawings wherein ||l dessecond ring 22. Coarse axially rotary adjustignates a projector supporting rod or'slide. This ments of the tube 23 are made by releasing the 50 rod'or slide |ll maybe suitably carried by a frame set screw 35 and turning the tube 23 by hand in a manner known in the art but forming no part and fine adjustments are made by tightening the of the present invention. A shaft rotatably set screw 36 and using the screw 43. journalled in the rod I0 is held against axial .At the top of the tube 29 is mounted a glass movement by a nut 12 and carries at its outer plate' 45 which serves as a support for a diaposi- 33 tive 46. The glass plate 45 is provided at its center with a suitable mark 41 and a suitable mark 46, such as a circle, is formed in the center of the diapositive 46. It is essential that the cen-' ter of the diapositive 46 and the center of the plate 45 be in alignment and a suitable mechanism shown in Figshi and is provided to obtain this alignment.

Two identical members press against two adjacent sides of the diapositive, preferably at the center of these sides. Each of these members consists of an arm 49 pivotally mounted at one end on a screw 59 which is threaded into the tube 29. An anti-friction roller 5| is rotatably mounted on a screw 52 on the other end of the arm 49 and a spring 53 presses the arm '49 toward the slide. Opposite each of the rollers 5|, the diapositive 46 is engaged by a roller 54 which is secured on a lever 55 by a screw 56. Each lever 55 is pivoted intermediate its ends on a screw 51 which is threaded into the tube 29 and the lever 55 is held in spaced relation to the tube 29 by a washer 58.

A shaft 59 is journalled in the tube 29 adjacent the free end of each lever 55 and carries a plate 60 upon which is secured an eccentric pin 6|. This pin 61 engages the free end of the lever 55 and moves it toward the diapositive 46 against the action of the spring 53 and roller 5|. Each shaft 59 extends outside of the tube 29 and is provided with an actuating knob 62. A friction washer 63 holds the shaft 59 in adjusted position. Two ordinary spring clips 64 engageopposite corners of the diapositive 46 and hold it fiat against the glass supporting plate 45.

A sleeve 65 is fixed within the tube 29 by a web 66 and a lens cell 61 carrying the objective 68 is slidably mounted within the sleeve 65. The lower end of the sleeve 65 is externally threaded to rec'eivea collar 69 having an internallye rojecting flange 19 which supports the cell 61 and objective 68. The collar 69 is rotated until the rear nodal point of the objective 68 is in a predetermined relation to the diapositive 46 and the objective 68 is then locked in this position by means of a threaded ring H.

The tube 29 has an outwardly projecting flange 12 and the wall 13 of the lamp house, engages the outside of the tube 29 and rests on this flange 12. The lamp house contains suitable condensers I4 and a light source I5. These elements are well known in the art. A slot 16 is provided in the lamp house between the condensers l4 and light source 15 to receive a suitable filter TI which may be inserted or removed by means of the handle 18.

In setting up the projector, the objective 68 is adjusted in the manner set forth above until its rear nodal point is at the proper predetermined position relative to the plate 45 and diapositive 46. The tube 29 without the collar 32 is then placed in the second ring 22 and the collar 33 is adjusted until the front nodal point ofthe objective 68 is at the point of intersection of the axes of shaft ll, ring 22 and tube 29. The collar 32 is then screwed into contact with the ring 22 and the tube 29 thus fixed against further axial movement. I

From the foregoing, it will be apparent that I am able to attain the objects of my invention and provide a new and improved projection assembly for aerial mapping. Various modifications can, of course, be made without departing frointhe spirit of my invention or the scope of'the appended claims.

1 tube in the second ring,

I claim:

1. A projector comprising a support, a shaft pivotally mounted in said support for movement about a horizontal axis, a ring carried by said shaft, a second ring pivotally mounted in the first-named ring, the pivotal axis of the second ring being coplanar with and perpendicular to the axis of the shaft, a tube, a diapositive support at one end of said tube, a sleeve within said tube, an objective lens slidably mounted in said sleeve, means for locking said lens in said sleeve so that its rear nodal point is located a predetermined fixed distance from said diapositive support, means for slidably and rotatably mounting said means for locking said tube in said ring so that the front nodal point of the lens is coincident with the pivotal axes of the shaft and second ring, and illuminating means above said diapositive support.

2. An adjustable mount for a projector having an illuminating system, a diapositive support and an objective lens mounted within a projecting sleeve in fixed relation to said diapositive support, said mount comprising a support, a shaft rotatably mounted in said support, a ring fixed on said shaft, a second ring rotatably mounted in said first-named ring with its axis perpendicular to and coplanar with the axis of the shaft, said second ring being adapted to receive the projecting sleeve of the projector, means for sliding the sleeve axially within said second ring until the front nodal point of the objective is substantially coincident with the axes of the shaft and second ring, and means for locking the sleeve in this position.

3. An adjustable mount for a projector having an illuminating system, a diapositive support, a sleeve projecting forwardly of said diapositive support and an objective lens mounted within said sleeve in fixed relation to said diapositive support, said mount comprising a support, a shaft rotatably mounted'in said support, a ring fixed at the outer end of said shaft, a second ring rotatably mounted in the first-named ring with its axis perpendicular to and coplanar with the axis of the shaft, said second ring being adapted to receive the sleeve of the projector, a collar threaded on said sleeve adapted to engage the top of the second ring,.means for adjusting said collar until the front nodal point of the objective is coincident with the intersection of the shaft axis and second ring axis, and a second collar threaded on said sleeve engaging the bottom of said second ring to secure the projector in adjusted position.

4. In a projector,-'a device for centering a rectangular object on the optical axis of the projector comp-rising, two arms pivotally mounted on the projector, a bearing element at the outer end of each arm, said bearing elements engaging adjacent sides of the object, spring means for pressing each arm toward the object, two levers pivotally mounted on the projector, a bearing element at the outer end of each lever, the lastnamed bearing elements engaging the sides of the object opposite the first-named bearing elements, operating means for moving said levers independently toward and from said object, and means extending outside of said projectors for actuating said operating means.

5. In a projector, a device for centering a rectangular object on the optical axis of the projector comprising, two arms pivotally mounted on the projector, a bearing element at the outer end of each arm,,said bearing elements engaging adjacent sides of the object, spring means for pressing each arm toward the object, two levers ments, a shaft rotatably mounted in said pro-v jector adjacent each lever, an eccentric on each shaft engaging the adjacent lever to move the lever toward said object, and an operating knob on each shaft outside of said projector.

OTTO E. TRAUTMANN. 

